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I am Really very Sorry for late reaction against your previous post, I think you are right about some communication problem in Automation SW & HW . But it is happening just for this IO module SM323 as I told that others are working fine .I have some spare Inputs too in this module all have deferent behavior . Some times also a communication fault accrued at HMI , Unfortunately I was not available at that communication fault time usually in the night .

thnx for info. In my opinion I'll be make that test sugested, but maybe reinsert again mentioned DI module again from library as new in HW cfg, simply maybe some problem can be with reconfiguration of some options inside DI module. Now we don't know where exactly problem can be, maybe configuration of DI module, some filter of scanning inputs or maybe something else. Also here comes problem with maybe program logic, simply therefore I sugesting that test. You'll have disabled all other logic and see only needed piece of test code/line of logic. Also maybe some informations can be located inside diagnostic buffer of CPU. Can you pls provide to us ecat type and order number of mentioned DI card?